Abstract. Solidification of radioactive waste resins using cement mixed with organic material i.e. biochar is described in this paper. Different percentage of biochar (0%, 5%, 8%, 11%, 14% and 18 %) was investigated in this study. The characteristics such as compressive strength and leaching behavior were examined in order to evaluate the performance of solidified radioactive waste resins. The results showed that the amount of biochar affect the compressive strength of the solidified resins. Based on the data obtained for the leaching experiments performed, only one formulation showed the leached of Cs-134 from the solidified radioactive waste resins.
Crude extracts from neem, Azadirachta indica, and God's crown, Phaleria macrocarpa, were tested at two concentrations, 5% and 10% for the insecticidal activity against pineapple mealybugs, Dysmicoccus brevipes under laboratory conditions. In this study, synthetic insecticide; dimethoate and commercial neem were used as positive control while water was used as a negative control. All treatments were applied using the topical bioassay method in five replications. In 24 hours after treatment, no mortality was recorded in all treatments. Only after 48 hours, 52% and 28% mortality were recorded in the sample treated with 10% and 5% of A. indica extract. Dysmicoccus brevipes treated with 10% A. indica extract, showed 100% mortality at 72 hours while the sample treated with dimethoate reached 100% mortality at 120 hours after treatment. In conclusion, the 10% of A. indica extract showed higher potency in comparison to other treatments including dimethoate, commercial neem and P. macrocarpa extract.
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